SIGSTKSZ
signalStack.ss_sp = malloc(SIGSTKSZ);
signalStack.ss_size = SIGSTKSZ;
set_signal_stack(sAlternateStack, SIGSTKSZ);
newStack.ss_size = SIGSTKSZ;
static char sAlternateStack[SIGSTKSZ];
&& (char*)pointer <= &sAlternateStack[0] + SIGSTKSZ;